Cement-kiln.



J @@oooaooGaGGGoGG I L T. M. MORGAN.

CEMENT KILN.

APPLIOATION FILED FEB. 1, 1907.

942,509, Patented Dec. f?, 1909.

long cylindrical tuhe,

downwardly freni its rear to its front end.

THOMAS MATTHEW MORGAN,

OE LONG PONT, QUEBEC, CANADA.

CEMENT-KILN.

Specification of Letters atent.

latented Dec. 7, 19h19.

Application filed. February l, 1907. Serial No. 355,190.

To all whom it may concern:

lle it kno\vn that I, Tnoims lllrirrI-{nw Mono-AN, of the village oi? Long Point, in the county of lilochelaga, lrovince of Quebec. and Dominion of Canada, have invented certain new and useful linprovenients in Ceinentdiilns, of which the following is a full, clear, and exact description.

This invention relatefs` to rotary kilns for burning cement. n

The ordinary cement kiln consists of a which is inclined As the kiln is revolved, the cement is gradually ,airied forward and is ejected at the niouth. ln order to conserve the heat and increase the eiiieiency. cenieiit kilns have heen considerably lengtliened durirnc),` recent years. This has not only added to the original cost of the kiln but has greatly increased the weight and, consequently, the cost of revolving` the kiln.

The object olf' this present invention is to' provide comparatively short kiln which will he less en'pcnsive holh lo construe and 'lo maintain in operation than the longer kilns, and that will. at the saine time, so conserve the heat lroin the ii'nel that the cfliciency will he greatly increased. To accomplish thisl ohject, l provide a kiln of lrustd conical torni considerably larger at the rear end than at the inoulh. '.lho longitudinal axis oit (he kiln is inclined in the usual inanner7 approxiniately three quarters of an inch lo lhc loot. while the hott-oni of the kiln remains in a horizontal plane. Near the rear end olf the kiln, l provide a wall having series of eircuinlcrential apertures 'which are ohliquely disposed with reference to Ithe axis oi' the kiln and which allonr the cement, ted in at the rear end of the kiln, to llow through by gravity toward the front, and, at the saine time, allow the burned gases to es cape into the stack. The central part of thc ivall is built up of any suitable material.

In order to prevent the cement at the rear end of the kiln troni being fed 'forward too rapidly, owing to the increased circumferential velocity at the enlarged end of the kiln, I provide one or more retarding rings which regulate the 'feed of the cement through the kiln. Giving to the increasel diameter, the velocity of the burning gaseis retarded at the enlarged end or? the kill. and large amount of ordito 'fen up in stack losses, is dcliected hack toward the niouth of the kiln by the retin-dingv rings and rear Wall, and absorbed hy the ce nient.

ln the drawings which illustrate my invern tionz-Figrurc l is a side elevation, partly in section, of the rear end eil the kiln litted with my device. Fig. 2 is a` perspective view of the rear end of the kiln showing the circinnierentiially apertured ivall.

Referring to the parts, l designates a kiln of truste-conical forni which is gradually enlarged toward its rear end Q. The longitudinal airis 3 is given the usual downward inclination, While the bottoni line Af lies in a horizontal. plane in order that the kiln may rest upon supports that lie in the saine horizontal plane.

5 designates the shell ci the kiln, and (3 the lire brick lining.

Near the rear end oli the kiln, l, provide a circular wall 7 having; a series oi' circum- Jerential apertures or channels 8, which are inclined ohliqnely with reference to the longitudinal axis or the kiln. These channels are preferably rectangular in cross section and are .formed of metal or other suitable inav terial, and are so positioned. that. when the kiln rotates in the direction indicated -by the ari-on', the cement, nihil-3h fed in at the rear end, will be scooped up at the mouth of the aperture by the aiilvancinfg; edges Sa oi' the channels and, on beingI carried around the circumference of the kiln, will fall hy gravity through the inclined channels toward thejront of the kiln. The central part of the wall 9 is closed in with lire brick. At a suitable distance in front of the wall 7, l. provide a retarding ring; 1G, which is formed hy increasing, the thickness of the lining G. second retarding ring ll, formed in the saine manner, is separated troni the first ring loy a chamber l2, as shown in lligg'. l. By this means the diameter of the enlarged end of the kiln is reduced at certain points so that the forward feed of the cement may he regulated to snit the requirements at the niouth of the kiln.

In the operation of the device, the cement f material is fed into the rear end 2 and piles up at the bottom of the kiln. 0n rotating the kiln in the direction of the arrow, the cement falls into and is scooped up by the channels 8 and, on being carried around the circumference, falls, by gravity, through 'the downwardly inclined channels 'to the trent ico of the wall. @wing to the increased circumferential velocity 4of the kiln at its enlarged end, the forward feed would be faster at the rear end than at the front end. By meansI of the retarding rings, however, which decrease lthe diameter of the kiln at certain intervals, the forward feed is regulated so that the material will not tend to pile up at the mouth of the kiln. The velocity of the heated gases traveling from the front to the rear, will be greatly retarded owing to the increasing sectional area toward the rea'r of thevkiln, and will further be deflected by the retarding rings and the rear wall 7 so that a great percentage of the heat will be retained within the kiln and absorbed by the cement. The hot gases which escape through the apertures 8, will heat the walls of sald apertures to high degree of intensity. These apertured channels, having a large heating surface and being submerged at each revolution in the cement, will impart their heat to' tire cement and be cooled thereby. In thls manner a .great percentage of the heat ordinarily lost in the stack will be absorbed by the cement and the eiciency of the kiln will be increased thereby. 2,

Further advantages will be apparent ira comparatively short kiln of this type. The kiln will be stronger, more durable, and

' less expensive both to construct and'to opcrate than the longer types of kilns. The revolving gear used to operatethe kiln 'of frusto conical'form, may be placed at the extreme rear end-without danger of undue strain. I Furthermore, the supports lying in the sameghorizontal plane, will n'ot loe so liable to damage from expansion' and contraction of the kiln, as those which operate under an inclined kiln.

While I have shown the deviceas applied to a kiln which is frusto-conical in form, it will be'obvious that the rear wall 7' may be built into any cylindrical kiln in the same manner and for the* same purpose, It will also be obvious that the construction shown herein may be modified without departing from the spirit of my invention.

Having thus described my invention, what I claim is l. A cement kiln of gradually increasing diameter, toward its rear end, a wall having Y a series of inclined channels within said kiln,

through said'wall, and one'or more retarding rings located between said wall and the mouth ofthe kiln.

In witness whereof I have hereunto set my 'hand in the presence of two witnesses.v THOMAS MATTHEW MORGAN. Witnesses:

C. W. TAYLOR, E. B. MoKnNzm. 

